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<div>Tony,</div>
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<div>At a very high level… We would suggest the following.</div>
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<li>Perform a through clean of the chamber and associated internals. Scrape and scrub to bare metal.</li><li>Line the inside of the bell jar with UHV Foil. </li><li>Use a new Al2O3 Crucible.</li><li>Make a note on your cryo maintenance log that you are running the system with Gadolinium.</li><li>Perform a mechanical pump oil change prior to deposition and after.</li></ol>
<div>Following these suggestions should lower the variables in your process. I agree with you about the poor studies in regard to the presentation of this element. I did see some papers where folks are using MBE for deposition. I wonder how that maintenance
campaign is performed! Cant be any worse than cleaning up a HgCdTe system!!! </div>
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<div>Good luck. </div>
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<div style="font-family: Calibri, sans-serif; font-size: 14px; ">-Len</div>
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<div style="font-size: 14px; "><font class="Apple-style-span" face="Helvetica"><b>Leonard E. Olona</b></font></div>
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<div style="font-size: 14px; "><font class="Apple-style-span" face="Helvetica" size="2">University of Oklahoma</font></div>
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<span style="font-weight:bold">From: </span>Tony L Olsen <<a href="mailto:tony.olsen@utah.edu">tony.olsen@utah.edu</a>><br>
<span style="font-weight:bold">Date: </span>Tuesday, March 4, 2014 6:15 PM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>" <<a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>><br>
<span style="font-weight:bold">Subject: </span>[labnetwork] Evaporation of Gadolinium<br>
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<p class="MsoNormal">All<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We have received a request to evaporate gadolinium. The request presents several handling and safety concerns, including contamination of the process chamber and vacuum pump. The toxic nature of gadolinium seems to be poorly studied,
resulting in some debate. We are uncertain if there is an appropriate approach to successfully and safely allow this material in an e-beam system. Does anyone have any experience, comments, or suggestions?<o:p></o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">tonyO<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Tony Olsen<o:p></o:p></p>
<p class="MsoNormal">Nanofab Cleanroom Supervisor/Process Engineer<o:p></o:p></p>
<p class="MsoNormal">University of Utah<o:p></o:p></p>
<p class="MsoNormal">36 S Wasatch Dr, Suite 2500 SMBB<o:p></o:p></p>
<p class="MsoNormal">Salt Lake City, UT 84112<o:p></o:p></p>
<p class="MsoNormal">801-587-0651 office<o:p></o:p></p>
<p class="MsoNormal">801-587-3077 fax<o:p></o:p></p>
<p class="MsoNormal"><a href="http://www.nanofab.utah.edu/"><span style="color:#6666CC">www.nanofab.utah.edu</span></a><o:p></o:p></p>
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